fix doc

thanks Toshihiro

doc/api/modules.markdown

@@ -242,7 +242,7 @@ then it does *not* add the full resolved path to where `./lib`
 is on the filesystem.  Instead, it literally adds `'./lib'`,
 meaning that if you do `require('y.js')` in `/a/b/x.js`, then it'll look
 in `/a/b/lib/y.js`.  If you then did `require('y.js')` in
-`/l/m/n/o/p.js`, then it'd look in `/l/m/n/o/p/lib/y.js`.
+`/l/m/n/o/p.js`, then it'd look in `/l/m/n/o/lib/y.js`.
 
 In practice, people have used this as an ad hoc way to bundle
 dependencies, but this technique is brittle.